_ISUser.dll is a DLL (Dynamic Link Library) file, developed by Microsoft, which is referred to essential system files of the Windows OS. The state when _ISUser.dll is missing on user’s PC could be a result of system malfunction, application conflicts, files corruption etc.
The DLL files usually contain a set of core procedures and driver functions, affecting overall system performance, which means _ISUser.dll issues usually affects negatively smooth PC performance, block some operations or applications.
Windows 11 is installed on your computer.
PC Repair utility is compatible with your OS and may automatically fix error code _ISUser.dll.
_ISUser.dll file is commonly associated with Microsoft® Visual Studio® 2015. It is an essential component, which ensures Windows programs operate properly. If the _ISUser.dll file is missing, it may negatively affect the work of the associated software.
Windows applications use _ISUser.dll to increase their performance and speed, like .exe files. _ISUser.dll is a stand-alone file and can be used by many programs.
“_ISUser.dll is missing” is the most common error code that users frequently can see on their PC. It means that a specific application or utility requires _ISUser.dll to run, but the DLL files are not located in Windows registry. Other common _ISUser.dll errors include:
It could be the result of the issue with the Visual C++ Redistributable for Visual Studio 2015 (x86/x64), when the _ISUser.dll file exists, but is not working properly.
This error code frequently relates to Ox error codes, and arises as additional permissions are not provided, through _ISUser.dll requires them. Full error code text indicates: “Access violation read to 0x00000000 in _ISUser.dll”.
The same error code meaning as “_ISUser.dll is missing” issue has.
The issue happens when you try to download and locate an old version of _ISUser.dll into the latest version of Visual C++, already installed on PC. It creates incompatibility of DLL files and could not perform properly.
It could be the result when users download and install an old, cracked, corrupted or not legitimate version of _ISUser.dll. Note: using unofficial websites to download _ISUser.dll is extremely dangerous, could harm your PC and not recommended at all.
It may happen when you try to download and install _ISUser.dll but the DLL file is cracked or corrupted.
The scenario where _ISUser.dll was successfully located in the Windows DLL library, but could not maintain the performance well. It may happen when the installed _ISUser.dll is old, corrupted or has version conflicts with Visual C++.
If the “_ISUser.dll is missing” issue or any similar error code arises, you may use one of the methods below – manual or automatic – to solve the issue.
The manual methods assume that you download the _ISUser.dll file and put it inside the game/application installation folder, while the automatic method is much easier and helps you fix the error code with the minimum effort.
Using PC Repair tool, you can automatically repair _ISUser.dll errors. The utility will download and install the correct version of _ISUser.dll and also resolve other issues related to the _ISUser.dll file.
Step 1. Click the “Download” button to get an automatic tool.
Step 2. Install the PC Repair utility by following simple installation instructions.
Step 3. Launch the program to fix the _ISUser.dll malfunctions and other issues.
If you suspect that the DLL error was caused by the changes someone made to the registry or other system configuration, then a System Restore could fix the DLL error code.
Type “Recovery” in the search box and go to the Recovery setting on control panel. Click on “Open System Restore”. Follow the instructions in the pop-up window and choose the restore point of the Windows image, created in the past. Usually Windows creates restore points automatically once in several months, so you can choose the best restore point from the list.
Operating system reset should restore all Windows DLL files to their original working versions. In many cases such solution helps fix the _ISUser.dll issues. Choose Recovery from the Settings menu on Windows 10. Go to Reset this PC, click on Get started button and follow the instructions.
You can choose a path to remove all personal files, settings and activate initial OS image or to keep all your files and settings alive and reset only system records.
_ISUser.dll issues could be a result of outdated hardware drivers. Driver updater updates drivers on Windows automatically. This utility helps you avoid manual search of a compatible drivers for your system and installs drivers for all hardware modules.
Step 1. Download a Driver Updater.
Step 2. Install and lunch the application.
Step 3. Driver Updater will scan your system for outdated and missing drivers.
Step 4. Click Update to update all the featured drivers.
Step 1. Open a search box and write “Device Manager” and press Enter.
Step 2. Look through the list of all hardware devices, click on the module needed to be updated.
Step 3. Click Update driver and choose Search automatically for drivers.
Frequently Windows doesn’t find a proper driver automatically, which supposes you need to find this driver manually using the manufacturer’s website.
_ISUser.dll is a part of Microsoft Visual C++ 2015 Redistributable, that is why it is advised to install the latest version of C++ library from the official Microsoft website.
Take into account, if you run 64bit system, it is recommended to install both 32bit version and 64bit version of C+++ libraries as 64bit OS typically runs 32bit and 64bit applications. It highly recommended to avoid downloading separate DLL files from unofficial websites as such files could be outdated, corrupted or include viruses, and eventually could harm your PC.
"Windows Defender" is a free antivirus software built in Windows 10. It is recommended to run a malware scan with Windows defender or any other reputable antivirus if _ISUser.dll issues still exist and the instructions from the previous paragraphs didn’t help.
Launch a Windows Defender Offline scan to make a deep malware scan:
Step 1. Type “Virus and Threat protection” in the search box of Windows 10.
Step 2. System scree will pop-up. Find and click on Scan options below the button Quick scan. The list of malware scans would roll out. Find Windows Defender Offline scan at the bottom of this list.
Save all temporary and unsaved docs before running the offline scan as Windows would reboot your PC. Windows Defender will run a comprehensive scan for viruses and malware after a reboot. In the end you will see reports and notifications of the results.
System File Checker (SFC) can easily check the registry and fix corrupted elements, that provoke the error code “_ISUser.dll is missing”.
Step 1. Type “Command prompt” in the windows search field, right-click on the result and select Run as administrator.
Step 2. Type “sfc /scannow” in Command Prompt and hit Enter.
After entering the command, a system check will begin. Once operation is complete, the report will appear: “Windows Resource Protection found corrupt files and successfully repaired them.”
Keep in mind that System File Checker (SFC) cannot fix integrity errors for those system files that are currently being used by operating system. To fix these files you have to run SFC command through the command prompt in the Windows recovery environment. You can get into Windows Recovery Environment from the login screen, by clicking Shutdown, then holding down Shift or F8 key while the system is rebooting.
OS affected: Windows XP/7/8/10/11.
Type: application malfunction, system files malfunction.
Symptoms: application not working, PC modules not working, boot up error codes.
Potential causes: Visual C++ Redistributable issues, DLL files incompatibility, DLL or registry files corruption, lack of system permissions.